Xiphophorus neuzalanahotl (Spotted sword)

The Xiphophorus Nezahualcoyotl fish is a freshwater fish native to the central and southern Americas. It is a small fish, with a maximum length of about 5 centimeters. The body of the fish is elongated and compressed laterally, with smooth and shiny scales. The color of the fish varies according to individuals, but they are generally gray, brown or dark green with dark longitudinal strips on the body. Fish has an ornamental veil tail, with white or yellow rays that can be deployed to attract sexual partners or to impress predators.

The Xiphophorus Nezahualcoyotl fish is a social and gregarious animal, which lives in groups in the shallow waters of rivers, lakes and ponds. The fish are active throughout the day, spending most of their time swimming and feeding on small invertebrates such as crustaceans and insects. Fish also has low tolerance with salt water, so it is generally found in fresh waters.

The Xiphophorus Nezahualcoyotl fish is a polygamous fish, that is to say that it can mate with several different partners. The males are generally more colorful than females, and they also have longer and brighter caudal rays. Males use these rays to attract females and to show their dominance to other males. Fish reproduce throughout the year, producing eggs that hatch in a few days. Young fish are very similar to adults, but they are smaller and clearer in color.

Due to their small size and ornamental beauty, Xiphophorus nezahualcoyotl fish is often used as a pet. They are also a subject of popular research in biology, due to their polygamous reproduction and their genetic variation. Although fish is common in its natural habitat, it is also threatened by loss of habitat and water pollution.